Wall tolerance applies to ends only, end preparation per ansi b16.25
A fitting that forms an angle of less than 180 degrees (3.141 radians) from a straight flow. Both connecting ends have machine threads (straight threads other than pipe or hose series) designed to accommodate a tube or is unthreaded and designed to accommodate a tube. It may have side or heel inlet(s). See also elbow, pipe and connector, multiple, fluid pressure line.
Classification: Threaded elbows and bends of iron or steel (other than cast iron or stainless steel) for pipes and tubes
NSN 5910-00-810-5649
NSN 5960-01-023-8800
NSN 5965-01-080-4021
NSN 2925-01-052-0636
NSN 5999-01-435-2214
NSN 5895-00-353-1795
NSN 6240-01-548-9846
NSN 5915-00-801-4242
NSN 6130-00-175-4819
NSN 5835-01-354-0566
NSN 2925-01-453-1606
NSN 5975-01-316-8956